Description: to write Scan pci bus programs must first consider the PCI spec inside Configuration SpaceHeader plans, and Class code is 24 bit (3byte), the group should be composed of three parts, the Base Class, Sub Class, programming Interface to the PCI BUS on the Base Class, Sub Class , Interface programming model with the original formula added to a circle to detect. Basically, as long as pci understand the structure and reuse examples of programs can be used to identify the pci device.
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